Crystal Reports crosstab problem

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Hi There I'm Develop a c# windows applciation With Reports in a report i have unknown number of columns so i use crosstab reports i want to add a row in the top of every page to sum previous rows in every column 
ex 
page 1 
total previous   column1 column2      column3   column4   column5   column6
                           20           30            15         32              26          70
row 1            column1    column2    column3   column4   column5  column6
                             5           7             8             12            15            20
                      row 2            column1      column2      column3   column4   column5   column6
                             15         20           16           30             20           18
page 2 
total previous   column1  column2        column3         column4        column5   column6
                             40        57            39           74             61             108            
                 then rows